Cheapest priced copy (Foundations Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Morkrut Necropod 
Creature — Slug Horror · 7/7 · Uncommon · Foundations Jumpstart · #466
Menace (This creature can't be blocked except by two or more creatures.)
Whenever this creature attacks or blocks, sacrifice another creature or land.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Jumpstart | 466 | Uncommon | $0.35 | — |
| Shadows over Innistrad | 125 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 8 April 2016In the unusual situation that you control no other creatures or lands, the last ability won't do anything. Morkrut Necropod can attack or block with no penalty.
- 8 April 2016When Morkrut Necropod attacks, its trigger doesn't resolve until after all attackers have been chosen. The same is true for when it blocks. This means that another creature, such as one enchanted with Invocation of Saint Traft, can also attack or block and then be sacrificed. Sacrificing a blocking creature this way doesn't cause the creature it blocked to become unblocked.